Arnica rydbergii


Pittonia 4: 36. 1899

Common names: Rydberg’s arnica
Treatment appears in FNA Volume 21. Treatment on page 371. Mentioned on page 367.
Plants 8–35 cm. Stems (branches from rhizomes) simple. Leaves 2–4 pairs (basal often persistent on sterile rosettes), mostly cauline; petiolate (at least basal) or sessile; blades oblanceolate to spatulate, 2–7 × 0.5–2.5 cm, margins usually entire, sometimes denticulate, rarely dentate, apices usually acute, sometimes obtuse, faces sparsely puberulent, moderately pubescent distally, stipitate-glandular. Heads 1–3(–5). Involucres turbinate-campanulate. Phyllaries 9–15, linear-oblong to narrowly lanceolate. Ray florets 6–10; corollas yellow. Disc florets: corollas yellow; anthers yellow. Cypselae brown, 4–7 mm, densely hirsute (not stipitate-glandular); pappi white, bristles barbellate. 2n = 38, 76.

Phenology: Flowering Jul–Aug.
Habitat: Dry to mesic, exposed, rocky alpine slopes and ridges or alpine meadows
Elevation: 1200–3400 m



Alta., B.C., Colo., Idaho, Mont., Oreg., Utah, Wash., Wyo.


Selected References


Lower Taxa


Facts about "Arnica rydbergii"
AuthorSteven J. Wolf +
AuthorityGreene +
Common nameRydberg’s arnica +
DistributionAlta. +, B.C. +, Colo. +, Idaho +, Mont. +, Oreg. +, Utah +, Wash. + and Wyo. +
Elevation1200–3400 m +
HabitatDry to mesic, exposed, rocky alpine slopes and ridges or alpine meadows +
Illustration copyrightFlora of North America Association +
IllustratorYevonn Wilson-Ramsey +
PhenologyFlowering Jul–Aug. +
Publication titlePittonia +
Publication year1899 +
ReferenceNone +
Source xml grained fna xml/V19-20-21/V21 929.xml +
SynonymsUndefined (tribe Undefined) subtribe Bahiinae + and Undefined (tribe Undefined) subtribe Palafoxiinae +
Taxon familyAsteraceae +
Taxon nameArnica rydbergii +
Taxon parentArnica +
Taxon rankspecies +
VolumeVolume 21 +